Source, distribution, and health risk assessment of polycyclic aromatic hydrocarbons in urban street dust from Tianjin, China
Source, distribution, and health risk assessment of polycyclic aromatic hydrocarbons in urban street dust from Tianjin, China
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DOI：
10.1007/s11356-013-2190-z
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发表时间：
2014-02
影响因子：
5.8
通讯作者：
Binbin Yu;Xiujie Xie;L. Ma;H. Kan;Qixing Zhou
中科院分区：
文献类型：
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作者：
Binbin Yu;Xiujie Xie;L. Ma;H. Kan;Qixing Zhou
为了更好地评估和了解暴露于城市街道灰尘的城市居民的潜在健康风险，对来自中国快速城市化的特大城市天津的87个城市街道灰尘样本中16种多环芳烃（PAHs）的总浓度、来源和分布进行了调查。同时，利用主成分分析（PCA）识别了PAHs的潜在来源，并利用增量终生癌症风险（ILCR）模型计算了居民通过城市街道灰尘接触PAHs的风险。结果表明，天津市城市街道灰尘中PAHs总量（ΣPAHs）范围为538 μg kg−1至34.3 mg kg−1，平均为7.99 mg kg−1。根据 PCA，二至三环和四至六环 PAH 分别占 ΣPAH 的 10.3% 和 89.7%。主要燃烧特定化合物之和(ΣCOMB) / ΣPAHs之比从0.57到0.79不等，平均为0.64。 Ant/(Ant + Phe)的比值从0.05到0.41不等，平均为0.10； Fla/(Fla + Pyr)从0.40到0.68，平均值0.60； BaA/(BaA + Chry)从0.29到0.51，平均0.38； IcdP/(IcdP + BghiP)从0.07到0.37，平均值为0.22。生物质燃烧、煤炭燃烧和交通排放是城市街道灰尘中PAHs的主要来源，比例相近。根据ILCR模型，儿童和成人的总癌症风险分别高达2.55 × 10−5和9.33 × 10−5。
To better assess and understand potential health risk of urban residents exposed to urban street dust, the total concentration, sources, and distribution of 16 polycyclic aromatic hydrocarbons (PAHs) in 87 urban street dust samples from Tianjin as a Chinese megacity that has undergone rapid urbanization were investigated. In the meantime, potential sources of PAHs were identified using the principal component analysis (PCA), and the risk of residents’ exposure to PAHs via urban street dust was calculated using the Incremental Lifetime Cancer Risk (ILCR) model. The results showed that the total PAHs (∑PAHs) in urban street dust from Tianjin ranged from 538 μg kg−1to 34.3 mg kg−1, averaging 7.99 mg kg−1. According to PCA, the two to three- and four to six-ring PAHs contributed 10.3 and 89.7 % of ∑PAHs, respectively. The ratio of the sum of major combustion specific compounds (ΣCOMB) / ∑PAHs varied from 0.57 to 0.79, averaging 0.64. The ratio of Ant/(Ant + Phe) varied from 0.05 to 0.41, averaging 0.10; Fla/(Fla + Pyr) from 0.40 to 0.68, averaging 0.60; BaA/(BaA + Chry) from 0.29 to 0.51, averaging 0.38; and IcdP/(IcdP + BghiP) from 0.07 to 0.37, averaging 0.22. The biomass combustion, coal combustion, and traffic emission were the main sources of PAHs in urban street dust with the similar proportion. According to the ILCR model, the total cancer risk for children and adults was up to 2.55 × 10−5and 9.33 × 10−5, respectively.